具很强生物活性者为( ) A．7-脱氢胆固醇 B．胆骨化醇 C．25-

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问题单项选择题

具很强生物活性者为( )

A．7-脱氢胆固醇
B．胆骨化醇
C．25-羟胆骨化醇
D．1，25-二羟胆骨化醇
E．维生素D

答案

参考答案：D

选择题

( )1.	A. I'm good at handwriting. B. I like English very much. C. Maths is very easy.
( )2.	A. You shouldn't stay up late. B. You shouldn't play too much on the computer. C. You should study hard.
( )3.	A. I should stay at home. Because today is a rainy day. B. I can make a snowman. Because it is snowing. C. I am going to the park. Because the weather is fine.
( )4.	A. They are quiet. B. They are sleepy. C. They are helpful.

阅读理解与欣赏

阅读下面的古代诗歌，完成题目。

溪居

柳宗元

久为簪祖^①累，幸此南夷谪。闲依农圃邻，偶似山林客。

晓耕翻露草，夜榜^②响溪石。来往不逢人，长歌楚天碧。

　　【注】①簪祖：古代官吏的服饰。②榜：摇船的用具。

清代沈德潜评价这首诗的思想感情时说：“不怨而怨。”你如何理解？请简要分析。

答：_________________________________________________